I see we've entered the fantasy part of the debate where we're told that greedy scientists made up climate change to keep that sweet grant money flowing while innocent fossil fuel companies just want to do what's best for the world.

For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 41,000 year cycle caused by changes ("precession") in the Earth's axis as it rotates around the sun, which change the location of the North African Monsoon. It is next expected to become green in about 15,000 years (17,000 AD). There is a suggestion that the last time that the Sahara was converted from savanna to desert it was partially due to overgrazing by the cattle of the local population.[8]